Shaving
The mathematical problem from Sunday evening.
If my beard grows at 0.42 mm per day and my length is 19.9 mm, how long do I not shave?
If my beard grows at 0.42 mm per day and my length is 19.9 mm, how long do I not shave?
Final Answer:

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You need to know the following knowledge to solve this word math problem:
arithmeticUnits of physical quantitiesGrade of the word problem
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